Vehicle Sensor Mounting on Engine Rear Wall for Pebble Protection
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Solution Overview
Problem
Existing sensor mounting structures for vehicle engines are vulnerable to water ingress and foreign objects, such as pebbles, which can compromise the long-term performance of the sensor.
Innovation Solution
A sensor mounting arrangement where the sensor is positioned on the vehicle's rearward lateral engine surface, overlapping with the driveshaft and protected by a flange section, ensuring it is shielded from water and foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is mounted to the vehicle-frontward wall surface of the engine block, then the sensor can be protected against pebbles and water by being covered by the compressor-mounting bracket, but the sensor is still vulnerable to water ingress through small gaps and cannot maintain long-term performance
Solution Approach 1:
The patent changes the mounting dimension from the frontward wall surface to the rearward wall surface of the engine block. This spatial repositioning moves the sensor to a location where it is naturally protected from water coming from the front, while still allowing pebble protection through the driveshaft arrangement. The dimensionality change resolves the contradiction by finding a new spatial solution that addresses both protection requirements.
Solution Approach 2:
The patent introduces the driveshaft as an intermediary protective element. The driveshaft is arranged to extend in the widthwise direction and overlap with the sensor when viewed from the rear, acting as a mediator that blocks pebbles and water from reaching the sensor. This intermediary structure provides the necessary protection without requiring additional dedicated shielding components.
2Object-affected harmful factors
If the sensor is mounted to the vehicle-rearward wall surface of the engine, then water ingress from the front end is prevented, but the sensor remains vulnerable to pebbles kicked up by front wheels
Solution Approach 1:
The driveshaft serves as an intermediary protective structure that extends in the widthwise direction and positions itself between incoming pebbles and the sensor. When viewed from the rear, the driveshaft overlaps with the sensor, creating a protective barrier against pebble impacts while maintaining the sensor's protected position from water ingress.
Solution Approach 2:
The driveshaft arrangement serves multiple functions: it transmits power to the front wheels and simultaneously acts as a protective barrier against pebbles and water for the sensor. This multi-functionality resolves the contradiction by making an existing component serve an additional protective role without adding separate protection systems.
3Reliability
If a dedicated protective structure is added to shield the sensor, then sensor protection is improved, but the device complexity increases
Solution Approach 1:
The patent makes the driveshaft serve a dual purpose: power transmission to the front wheels and protective shielding for the sensor. By utilizing the existing driveshaft structure for both functions, the patent avoids adding dedicated protective components, thereby maintaining simplicity while achieving reliable sensor protection against both water and pebbles.
Data Source
AI summary
Disclosed is an arrangement structure for a sensor to be mounted to an engine of a vehicle, wherein the engine is arranged in an engine compartment 2 of the vehicle in a posture allowing a crankshaft 8 of the engine to be oriented in a widthwise direction of the vehicle. The arrangement structure comprises a driveshaft 50 arranged along a vehicle-rearward lateral surface of the engine 1 facing in a rearward direction of the vehicle, to rotatably drive a front wheel, and a flange section 28a provided as a joining section between two members (12, 15) constituting the engine 1, to protrude in the rearward direction of the vehicle and at a height position below that of the driveshaft 50, wherein the sensor 42 is mounted to the vehicle-rearward lateral surface of the engine 1 at a height position located above the flange section 28a and in overlapping relation with the driveshaft 50 when viewed from a rear side of the vehicle. The arrangement structure of the present invention is capable of more reliably protecting the sensor mounted to the engine against foreign objects, such as water and a pebble, to adequately maintain performance of the sensor on a long-term basis.